Jeez, I think I would go out to his car with a tire iron and commence to whaling his rear view mirrors off of his car, because it's safer you know. That's his words. Seriously, I would check the OSHA website and look at what they say. You can even send them an e-mail and ask what they think. I have worked with OSHA inspectors and they are not the nazis they are made out to be.
Did something happen to bring this on? I wish that the companies I have worked for ran so smoothly that all the head office had to worry about were the rearview mirrors on forklifts